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Texas Instruments LM2770SDX-1215/NOPB
- Part No.:
- LM2770SDX-1215/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LM2770SDX-1215/NOPB.pdf
- Description:
- IC REG CHG PUMP PROG 250MA 10SON
- Quantity:
- Payment:
- Shipping:
Inventory:1,364
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Product details
Overview
LM2770SDX-1215/NOPB from Texas Instruments is a switched capacitor step-down DC/DC regulator with dual-output-voltage capability (1.2V/1.5V), dynamic VSEL control, sleep-mode LDO bypass, and 250 mA output current capability. It operates from 2.7V to 5.5V input, achieves >85% peak efficiency, and delivers ±3% output voltage accuracy - optimized for Li-ion–powered portable electronics requiring low-noise, high-efficiency power conversion.
For engineers reviewing the LM2770SDX-1215/NOPB datasheet, LM2770SDX-1215/NOPB pinout, LM2770SDX-1215/NOPB application, or LM2770SDX-1215/NOPB equivalent, key selection considerations include its multi-gain charge pump architecture (G = 1/3, 1/2, 2/3), PFM regulation behavior, WSON-10 thermal performance (θJA = 55°C/W), and dual-voltage dynamic scaling for DSP/baseband subsystems.
Technical Context
The LM2770SDX-1215/NOPB implements a pulse-frequency-modulated (PFM) two-phase fractional-gain charge pump using external flying capacitors C1 and C2 to achieve three discrete voltage gains (⅓, ½, ⅔), automatically selecting the most efficient gain based on VIN–VOUT ratio and load current. Its regulation loop maintains output stability without inductors, relying on internal reference (0.61V) and feedback resistors.
Sleep mode disables the charge pump and engages a dedicated low-noise linear regulator delivering up to 20 mA with 50–65 µA quiescent current; full-power mode draws 55–75 µA and supports up to 250 mA. Logic-controlled EN, SLEEP, and VSEL pins enable precise sequencing, voltage scaling, and power-state management in battery-constrained systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li-ion (2.7V cutoff) and USB-powered systems. |
| Output Voltage Options | 1.2V / 1.5V pair - selected dynamically via VSEL logic pin; ±3% accuracy over temperature and load. |
| Max Output Current | 250 mA in full-power mode - sufficient for baseband processors and low-power DSP cores. |
| Peak Efficiency | >85% at 100 mA, VOUT = 1.5V - exceeds fixed-gain charge pumps and LDOs across wide VIN range. |
| Sleep Mode Supply Current | 50–65 µA - enables ultra-low-power standby for mobile pagers and always-on sensors. |
| Switching Frequency | 475–925 kHz - PFM operation yields variable frequency; no EMI filter required in many layouts. |
| Thermal Resistance θJA | 55°C/W (WSON-10) - requires minimum 25 mm² copper pad under DAP for 105°C junction limit. |
Pinout & Package
LM2770SDX-1215/NOPB uses the WSON-10 package (3 mm × 3 mm × 0.8 mm) with exposed die-attach pad (DAP) for thermal dissipation. Pin numbering follows standard top-view counterclockwise layout starting from pin 1 (VSEL) near notch/mark.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSEL | Output voltage select logic input | High = 1.5V output; Low = 1.2V output - enables dynamic voltage scaling without firmware reconfiguration. |
| EN | Enable logic input | High = active regulation; Low = shutdown (0.1–0.5 µA ISD) - disconnects VOUT from VIN internally. |
| C2+, C2− | Flying capacitor 2 terminals | Form second phase of charge transfer network; require 1.0 µF X5R/X7R MLCCs with ≤15 mΩ ESR. |
| GND | Power and signal ground | Common return for all internal circuits; must be connected to DAP and low-impedance PCB plane. |
| C1+, C1− | Flying capacitor 1 terminals | Form first phase of charge transfer; identical capacitor requirements as C2; critical for gain switching fidelity. |
| VIN | Main input supply | Accepts 2.7–5.5V; requires 10 µF low-ESR ceramic input capacitor (CIN) placed within 3 mm of pin. |
| VOUT | Regulated output | Delivers 1.2V or 1.5V depending on VSEL; requires 10 µF low-ESR ceramic output capacitor (COUT). |
| SLEEP | Sleep mode logic input | High = LDO-only operation (≤20 mA, low noise); Low = full-power charge pump mode (≤250 mA). |
Key Features
| Feature | Design Value |
|---|---|
| Multi-gain charge pump (G = ⅓, ½, ⅔) | Automatically selects optimal gain to maximize efficiency across 2.7–5.5V input and 1–250 mA load range. |
| Dynamic VSEL voltage scaling | Enables real-time switching between 1.2V and 1.5V outputs - reduces system power when core voltage can be lowered. |
| Sleep-mode LDO bypass | Provides low-noise, low-quiescent-current (50–65 µA) regulation for ≤20 mA loads - eliminates PFM ripple during standby. |
| Integrated protection | Includes short-circuit protection (400 mA typ.), current-limit in sleep mode (60 mA), thermal shutdown (150°C), and soft-start (200 µs). |
| WSON-10 package | 3 mm × 3 mm footprint with exposed DAP - enables compact, thermally robust layout in space-constrained portable PCBs. |
Applications
| DSP Power Supplies | Baseband Power Supplies |
|---|---|
Use Scenario: Powering TI C5000/C6000-series DSPs during active computation and low-power idle states. IC Role / Device Role / Timing Role: Primary step-down regulator delivering dynamically scaled 1.2V/1.5V core voltage with fast VSEL response (<40 µs). Use Value: Reduces total system power by lowering DSP core voltage during non-intensive tasks while maintaining regulation integrity. |
Use Scenario: Supplying RF transceiver baseband ICs (e.g., TI TRF3705) requiring clean, stable low-voltage rails. IC Role / Device Role / Timing Role: Dual-rail source providing 1.2V analog and 1.5V digital supplies with independent sleep-mode control. Use Value: Sleep-mode LDO eliminates switching noise during receive standby, improving SNR in sensitive RF front-ends. |
| Mobile Phones and Pagers | Portable Electronic Equipment |
Use Scenario: Main processor core supply in GSM/EDGE feature phones powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: High-efficiency buck converter operating across full battery discharge curve (4.2V → 2.7V) with seamless gain transitions. Use Value: Extends talk time by >12% versus fixed-gain charge pumps due to adaptive gain selection and PFM idle current minimization. |
Use Scenario: Power management for handheld medical devices (e.g., glucose meters, pulse oximeters) requiring long shelf life and low EMI. IC Role / Device Role / Timing Role: Single-chip solution replacing inductor-based buck + LDO combo - eliminates magnetic fields and saves board area. Use Value: WSON-10 package and capacitor-only design meet stringent size and EMI requirements for Class II medical certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM27762DSGR | Single 1.8V output; integrated 2.2 µF flying caps; no VSEL or sleep mode; 200 mA max. | Lacks dynamic voltage scaling and low-noise sleep LDO - unsuitable for dual-voltage or ultra-low-noise use cases. | Select only if fixed 1.8V output and simplified BOM outweigh need for voltage flexibility and noise control. |
| MAX8814EUB+T | 1.2V/1.5V output; 200 mA; 55 µA IQ; but uses fixed 1.5 MHz PWM (not PFM) and lacks sleep-mode LDO. | Higher EMI due to fixed-frequency operation; no low-noise standby mode - limits use in RF-sensitive designs. | Prefer when deterministic switching frequency is required for EMI filtering, and sleep-mode noise suppression is not needed. |
Compared with LM2770SDX-1215/NOPB, LM27762DSGR trades voltage flexibility and noise performance for integration and reduced external component count, while MAX8814EUB+T sacrifices PFM efficiency and sleep-mode LDO benefits for predictable EMI behavior - making LM2770SDX-1215/NOPB uniquely suited for dual-voltage, battery-life–critical portable systems.
Availability
LM2770SDX-1215/NOPB is available at Aetrix Electronics and suitable for DSP power supplies, baseband subsystems, and mobile phone core voltage regulation requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for LM2770SDX-1215/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of leadership in high-efficiency power conversion ICs.
The LM2770 product line was designed specifically for portable electronics requiring inductorless, high-efficiency, dynamically scalable power - targeting battery-powered DSP, baseband, and RF subsystems where size, noise, and energy efficiency are critical.
FAQ
What output voltage options does the LM2770SDX-1215/NOPB support?
The LM2770SDX-1215/NOPB supports a fixed 1.2V/1.5V output voltage pair. The VSEL pin selects between them: logic-high yields 1.5V (±3% accuracy), logic-low yields 1.2V (±3%). This pairing is factory-configured and cannot be altered; other variants like LM2770SDX-12157/NOPB offer 1.2V/1.575V instead. The LM2770SDX-1215/NOPB does not support arbitrary or programmable output voltages.
How does the LM2770SDX-1215/NOPB achieve high efficiency without an inductor?
The LM2770SDX-1215/NOPB uses a switched-capacitor (charge pump) topology with three selectable fractional gains (⅓, ½, ⅔) and pulse-frequency modulation (PFM) control. By dynamically choosing the gain that best matches the VIN–VOUT ratio and load current, it minimizes switching losses and achieves >85% peak efficiency - eliminating inductor-related size, cost, and EMI concerns while maintaining tight regulation. The LM2770SDX-1215/NOPB relies on external flying capacitors C1 and C2 rather than magnetic energy storage.
What is the role of the SLEEP pin on the LM2770SDX-1215/NOPB?
The SLEEP pin on the LM2770SDX-1215/NOPB controls transition between two distinct operating modes: logic-high activates a low-noise, low-quiescent-current (50–65 µA) bypass LDO delivering up to 20 mA, ideal for standby; logic-low enables the full-power switched-capacitor regulator supporting up to 250 mA. This dual-mode architecture allows the LM2770SDX-1215/NOPB to eliminate PFM ripple during light-load conditions while preserving high efficiency under heavy loads.
Can the LM2770SDX-1215/NOPB be used with input voltages below 2.7V?
No - the LM2770SDX-1215/NOPB has a specified minimum input voltage of 2.7V per its Absolute Maximum and Operating Ratings. Operation below 2.7V may result in failure to regulate, unpredictable gain selection, or inability to maintain output voltage under load. For sub-2.7V applications, alternative regulators such as the TPS60403 (1.8V–5.5V input) or LTC3240-1.8 should be evaluated, as the LM2770SDX-1215/NOPB is not characterized or guaranteed for reliable operation outside 2.7V–5.5V.
What capacitor types are recommended for the LM2770SDX-1215/NOPB?
Texas Instruments specifies low-ESR multilayer ceramic capacitors (MLCCs) with X5R or X7R dielectrics for CIN, COUT, C1, and C2. Recommended values are 10 µF for CIN/COUT and 1.0 µF for C1/C2, all rated ≥6.3V. Y5V/Z5U ceramics are explicitly discouraged due to severe DC-bias capacitance loss and temperature drift. Tantalum and aluminum electrolytics are not recommended because their high ESR degrades efficiency and increases output ripple - the LM2770SDX-1215/NOPB's performance depends critically on low-ESR ceramic implementation.
LM2770SDX-1215/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V, 1.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 250mA
- Frequency - Switching:
- 700kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-SON (3x3)
LM2770SDX-1215/NOPB FAQ
1.How can I place an order for LM2770SDX-1215/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2770SDX-1215/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM2770SDX-1215/NOPB reliable?
The price and inventory of LM2770SDX-1215/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2770SDX-1215/NOPB is usually 5 days.
3.What payment methods are accepted for LM2770SDX-1215/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2770SDX-1215/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2770SDX-1215/NOPB?
LM2770SDX-1215/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2770SDX-1215/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM2770SDX-1215/NOPB?
For technical support, including LM2770SDX-1215/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2770SDX-1215/NOPB requirements.
6.How does Aetrix verify that LM2770SDX-1215/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2770SDX-1215/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM2770SDX-1215/NOPB meets industry standards.
7.What is the process for return or replacement of LM2770SDX-1215/NOPB?
All LM2770SDX-1215/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2770SDX-1215/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM2770SDX-1215/NOPB part is unused and in its original packaging.
Return procedure for LM2770SDX-1215/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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